KR102244923B1 - Manufacturing method of the Suspension arm for vehicle - Google Patents

Abstract

The present invention relates to a method of manufacturing a vehicle suspension arm, comprising: a blanking step (S10) and a forming step (S20) of processing a base material to form an arm body with leg portions formed on both left and right sides of a reference portion formed at one end. , Flanging and striking step (S30), piercing step (S40) of forming a through part in the reference part, a ball joint connecting part forming and finishing step of forming a shape of a ball joint connecting part by performing burring processing on the periphery of the through part (S50). The bush pipe coupling step (S60) of coupling the hollow bush pipe to the leg portions of both ends of the arm body, the ball joint assembling step (S70) coupling the ball joint to the inside of the formed ball joint connection part (S70), plastic resin inside the edge of the arm body A plastic resin insert molding step (S80) of injecting a plastic resin insert molding step (S80) and a bush coupling step (S90) of assembling by pressing the bush into the bush pipe provided in the leg portions of both ends of the arm body on which the plastic resin insert molding is completed (S90); including, but the ball joint The connection part forming and finishing step (S50) includes a boss part forming step (S501) of forming a boss part having a predetermined height to one side of the edge of the penetrating part formed through the piercing step (S40), and the diameter gradually increasing to the outer periphery of the formed boss part. A multi-stage drawing step (S501) of integrally forming the ball joint connection portion to the arm body by increasing the height in the vertical direction while increasing the height in the vertical direction by pressing through the die having the shrinking hollow bushing in multiple stages (S501). .

Description

Manufacturing method of the suspension arm for vehicle {Manufacturing method of the Suspension arm for vehicle}

The present invention relates to a method of manufacturing a vehicle suspension arm, and in particular, to a method of manufacturing a vehicle suspension arm that simplifies the manufacturing process of a suspension arm installed between a vehicle body or an axle and a wheel, and improves the durability of parts. .

The suspension system installed in the vehicle is an important device that improves riding comfort and improves driving safety by connecting the axle and frame (body) or connecting the wheel and axle or body to absorb shock or noise transmitted from the road surface to the vehicle body while driving. Is one.

The main elements of the suspension are composed of springs, stabilizers, and quick-up shock absorbers, and the types of suspensions are divided into an integrated axle suspension and an independent suspension.

The independent suspension system is designed to improve ride comfort and driving safety by dividing the axle to make both wheels move independently of each other.It is mainly applied to small passenger vehicles, and the type of independent suspension system is Wishbow type, McPherson. There are types, trailing link types, and swing axle types.

Among them, the Wishbow type, which is the most used type, is composed of a suspension arm, that is, an upper control arm and a lower control arm, a steering knuckle, and a coil spring.

Among the above configurations, the suspension arm (upper/lower control arm) related to the present invention has one end connected to a cross member or frame constituting a vehicle body, and the other end connected to a knuckle coupled to a wheel through a ball joint.

Such a suspension arm connects and supports the wheel to the vehicle body, and appropriately controls the driving direction of the wheel according to the driving state of the vehicle, thereby improving the vehicle's straight forward driving performance and steering stability.

The conventional suspension rock, which plays a large role in the driving and steering stability of a vehicle, is mainly manufactured by a casting method and a press method, and in the case of the casting method, a suspension rock is manufactured by injecting and solidifying a molten steel or aluminum into a mold and forming it.

In addition, in the case of the press method related to the present invention, the upper plate and the lower plate made of a steel sheet are formed by a press to weld the upper plate and the lower plate, and the bush pipe and the ball joint pipe are welded to manufacture a suspension arm.

However, the suspension arm manufactured in such a conventional manner has a problem that the weight is heavy and the manufacturing process is complicated, and there is a concern that the steel sheet is weak in deformation and stiffness due to welding bonding.

To this end, various inventions have been devised to solve the problems of the conventional suspension arm and to achieve weight reduction.

As an example,'Vehicle control arm and its manufacturing method' of Patent Publication No. 10-2010-0116081 (published date: October 29, 2010), and'Ball of Patent Registration No. 10-1732063 (registration date: April 25, 2017). Joint-integrated vehicle hybrid arm and its manufacturing method', Patent Publication No. 10-2017-0013573 (published date: 2017.02.07)'Vehicle's upper arm', Patent Registration No. 10-1747336 (Registration date: 2017.06.08) ) Of the vehicle hybrid suspension and the manufacturing method for manufacturing the same,'Hybrid Suspension' of Patent Registration No. 10-1826825 (Registration Date: 2018.02.01) was conceived to reduce the weight of the suspension and improve the rigidity of the suspension. I did.

In particular, the hybrid suspension arm, which is one of the most improved forms in the prior art, is also made of a number of processes as shown in FIG. 1, and in particular, welding a ball joint pipe for fixing the ball joint that is coupled to the steering knuckle coupled to the wheel. In this regard, by performing the first and second welding, the work process is not only complicated, but it takes a lot of work time, and the production efficiency is lowered by having to perform a separate post process after the welding work, and there is a limit to producing high-quality products there was.

-Patent Publication No. 10-2010-0116081 (published date: 2010.10.29, title of invention: vehicle control arm and its manufacturing method) -Patent Registration No. 10-1732063 (Registration date: 2017.04.25, Invention title: Hybrid arm for a ball joint integrated vehicle and its manufacturing method) -Patent Publication No. 10-2017-0013573 (published date: 2017.02.07, title of invention: upper arm of vehicle) -Patent Publication No. 10-2017-0013573 (published date: 2017.02.07, title of invention: upper arm of vehicle)

The present invention has been conceived to improve the problems of the conventional suspension rock, and provides a method for manufacturing a vehicle suspension rock that improves the stiffness, marketability and durability of important parts of the suspension rock, and enables the production of high-quality products. There is a purpose for sake.

In order to achieve the above object, the method of manufacturing a vehicle suspension arm according to the present invention comprises a base material in order to form a U-shaped or V-shaped arm body by forming leg portions on both left and right sides based on a reference portion formed at one end. Blanking step of processing; A forming step of processing the primary shape of the blanked base material using a press; A flanging and striking step of forming a flange having a predetermined height in one direction to improve rigidity and a bonding force of the insert-molded product at the edge of the foamed base material; A piercing step of forming a through portion in the reference portion for mounting of a ball joint coupled to a steering knuckle coupled to a wheel; A ball joint connecting portion finishing step of forming a shape of a ball joint connecting portion by performing burring processing on the inner periphery and outer periphery of the through portion formed in the piercing step; A bush pipe coupling step of coupling a hollow bush pipe so that a bushing for connection to a vehicle body or a frame can be fastened to the leg portions of both ends of the arm body; A ball joint assembly step of rotatably coupled to the arm body by pressing the ball joint into the formed ball joint connecting portion; A plastic resin insert molding step of injecting a plastic resin into the edge of the female body by inserting the female body with the ball joint assembled into the injection mold; A bush coupling step of separating the plastic resin insert molding completed arm body from the injection mold and assembling by pressing the bush into the bush pipe provided at both ends of the leg portion; Including, wherein the forming and finishing step of the ball joint connection part, the piercing step A die having a boss part forming step of forming a boss part having a predetermined height in one direction at the edge of the through part formed through the through part, and a hollow bushing gradually decreasing in diameter to the outer circumference of the boss part formed in the boss part forming step in multiple stages. A multi-stage drawing step of integrally forming a ball joint connection part for fastening a ball joint to the arm body by increasing the height in the vertical direction by pressing through and increasing the height to have a predetermined thickness.

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According to the above-described method for manufacturing a suspension arm for a vehicle according to the present invention, a ball joint pipe to which a ball joint that is connected to a wheel side and receives a large force is coupled, as well as improving stiffness while lowering the weight of the suspension arm itself. Because it is formed integrally by thickening in, it is possible to improve the workability and productivity by reducing the welding point compared to the conventional suspension rock, as well as improving the durability of the suspension rock by reducing the corrosion of the welding area.

In particular, in the suspension arm according to the manufacturing method of the present invention, the ball joint connection part that receives the most force transmitted from the wheel side is formed by increasing the base material of the arm body itself, thereby reducing the difficult work process of the operator, The adoption of the non-contact method not only improves the marketability of the basalt itself, but also provides a useful effect to increase price competitiveness.

1 is a manufacturing process diagram of a conventional hybrid suspension rock,
Figure 2 is a perspective view of an exterior view of a vehicle suspension arm manufactured by a method for manufacturing a vehicle suspension arm according to an embodiment of the present invention;
3 is a separated state diagram of a vehicle suspension arm manufactured by a method for manufacturing a vehicle suspension arm according to an embodiment of the present invention;
4 is an exemplary diagram illustrating a multi-stage increase process of a ball joint pipe integrally configured with a suspension arm manufactured according to a method of manufacturing a vehicle suspension arm according to an embodiment of the present invention;
5 is a manufacturing process diagram of a vehicle suspension arm according to the present invention.

The suspension arm manufactured by the manufacturing method of the suspension arm for a vehicle according to an embodiment of the present invention has a length of the base material around the penetration part formed in the arm body through a multi-stage drawing process where the ball joint connection part fixedly supported so that the ball joint is rotatably coupled. It is characterized by increasing the thickness and providing a integrated suspension rock.

That is, the suspension arm manufactured by the method of manufacturing a vehicle suspension arm according to a preferred embodiment of the present invention is provided with a reference part at one end, and a U-shaped or V-shaped part is symmetrical to each other from the center extending a certain distance from the end of the reference part. An arm body made of high-tensile steel steel having leg portions spaced apart in a shape; A flange portion bent to a height lower than a width of the reference portion and the leg portion in one direction at the edge portion of the arm body; A through-hole formed vertically through a predetermined size at one end of the arm body for mounting of a ball joint coupled with a steering knuckle coupled to a wheel; A hollow bushing whose diameter gradually decreases around the protrusion formed at a certain height in one direction from the edge of the through part passes through the upper and lower dies provided on one side in multiple stages, while gradually decreasing the diameter of the protrusion and gradually increasing the thickness and height of the arm. A ball joint connecting portion integrally formed in the body; A hollow bush pipe coupled to the ends of both leg portions of the arm body in a direction perpendicular to the through direction of the ball joint connection portion to fasten bushings for connection to the vehicle body or the frame; A ball joint that is press-fit into the ball joint connection part, one end is rotatably coupled to the arm body, and the other end is provided to be coupled to a wheel-side steering knuckle; Consists of a configuration including a; plastic resin mold that is injected into the flange portion of the arm body to reinforce the rigidity of the arm body and integrally molded with the arm body.

Particularly, a plurality of reinforcing ribs are further formed at regular intervals in the width direction of the reference portion and the leg portion so as to increase the rigidity of the plastic resin mold and increase the rigidity of the arm body inside the flange portion of the arm body. It is preferable to be configured to be equal to or lower than the height of the flange portion formed at the edge portion.

In the manufacturing method for manufacturing such a vehicle suspension arm, a reference portion is provided at one end, and an arm body having a U-shaped or V-shaped leg portion is formed to be symmetrical to each other by extending a predetermined distance from the reference portion to both left and right sides. A blanking step of cutting a high-tensile steel steel having a predetermined thickness into a predetermined size and shape to process the base material; A forming step of processing the primary shape using a press on the blanked base material so as to have the shape of the arm body; Flanging and striking steps of forming a flange to protrude a certain height in one direction in order to improve rigidity and a bonding force of the insert-molded product at the edge of the foamed base material; A piercing step of forming a penetration portion having a predetermined size at one end reference portion of the arm body for mounting a ball joint coupled to a steering knuckle coupled to a wheel; A ball joint connecting portion forming and finishing step of forming the shape of the ball joint connecting portion by performing burring processing on the inner periphery and outer periphery of the formed protrusion; A bush pipe coupling step of coupling a hollow bush pipe so that a bushing for connection to a vehicle body or a frame can be fastened to the leg portions of both ends of the arm body; A ball joint assembly step of rotatably coupling the ball joint to the arm body by pressing the ball joint into the completed ball joint connecting portion; A plastic resin insert molding step of injecting plastic resin into the edge of the arm body by inserting the arm body assembled with the ball joint into the injection mold; And a bush assembly step of separating the plastic resin insert-molded arm body from the injection mold and assembling the bush by pressing the bush into the bush pipe provided in the leg portions at both ends.
In particular, the forming and finishing of the ball joint connection includes a boss forming step of forming a boss portion having a predetermined height in one direction from an edge of the penetrating portion formed through the piercing step, and a boss portion formed around the penetrating portion having a predetermined height and In order to integrally form the ball joint connection part for fastening the ball joint by increasing it to a certain thickness, the diameter of the protruding part is gradually reduced by gradually decreasing the diameter of the protruding part through a multi-stage die equipped with a hollow bushing that gradually decreases in diameter toward the outer periphery of the protrusion. It further comprises a; multi-stage drawing step of gradually increasing the height.

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Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings in the specification.

In describing the suspension arm for a vehicle manufactured according to an embodiment of the present invention, a detailed description of known related configurations or functions will be omitted, and a detailed description will be given focusing on the main parts and features of the present invention.

In addition, for convenience of explanation of the configuration of the invention, one or one end is indicated according to the direction indicated in the drawings, and the corresponding or symmetrical side thereof is referred to as the other or the other end.

In addition, the vehicle suspension arm shown in the drawings is modified and used in various forms according to the size or type of the vehicle, but the embodiment of the present invention is limited to a representative example thereof, and in general, the vehicle suspension arm is a wheel Although it is divided into upper and lower basalts on the inner upper and lower sides of, in the detailed description of the present invention, it will be collectively referred to as'suspension for vehicles' without being divided into either.

In addition, in the suspension arm for a vehicle manufactured according to an embodiment of the present invention, an arm body is manufactured based on high-tensile steel steel, and a plastic resin composition is inserted into the arm body to insert a plastic resin mold into the arm body. It is about a so-called'hybrid-type suspension rock' that is integrally molded.

FIG. 2 shows an assembled exterior state of a vehicle suspension arm 100 manufactured according to an embodiment of the present invention, and FIG. 3 is a main part of a vehicle suspension arm 100 manufactured according to an exemplary embodiment of the present invention. Separate states are shown respectively.

2 and 3, a vehicle suspension arm 100 manufactured according to an embodiment of the present invention includes an arm body 110 made of a high-tensile steel plate and an upper surface of the arm body 110. It is injection-molded, and the plastic resin mold 140 is integrally combined with the arm body 110.

The arm body 110 has a shape slightly protruding from the central portion 120 (hereinafter referred to as'reference portion') to one side, and has two legs in a U-shaped or V-shaped structure on both sides of the reference portion 120 It consists of a shape in which the (leg) part 130 is provided.

In addition, the ball joint 200 is rotatably coupled to the center of the reference portion 120 in the vertical direction, and the bush pipe 160 to which the bush 300 is coupled to each of the ends of the two leg portions 130 is welded. It consists of a combined configuration.

That is, the ball joint 200 is rotatably coupled to the ball joint connection unit 170 provided on the reference unit 120 with a spherical ball stud in a state in which a plurality of parts are assembled to be installed on the inside of a wheel, not shown. The steering knuckle and the bush 300 coupled to the two bush pipes 160 are configured to be elastically connected to the vehicle body side.

As shown in the separated state diagram of Figure 3, the vehicle suspension arm 100 manufactured according to the embodiment of the present invention has a plurality of reinforcing ribs 117 inside the arm body 110 composed of a high-tensile steel plate at a predetermined interval In the process of curing the plastic resin injected into the upper surface or the inside of the arm body 110 by being combined with the arm body 110, as well as to increase the rigidity of the arm body 110 itself and maintain its shape. To be able to.

The arm body 110 made of a high-tensile steel sheet is subjected to a blanking process to a desired standard, and the cut steel sheet is first processed into a predetermined required shape through a forming process, and then the bonding force with the plastic resin is obtained when the plastic resin mold is injected. It is more preferable that the flange portion 115 having a predetermined height is additionally formed by bending in the inward direction along the edge of the reference portion and both leg portions so as to increase it.

The arm body 110, which has been trimmed into a certain shape through blanking and forming processes, has a through part 116 of a certain diameter vertically formed at one end of the reference part 120 through a predetermined piercing process, so that the ball joint 200 ) The ball joint connection 170 for fastening is configured to be integrally molded with the arm body.

The ball joint connection part 150 is integrally formed with the arm body 110 through a multi-stage drawing process as shown in FIG. 4.

That is, the ball joint connection part provided in the conventional suspension arm is configured so that the ball joint can be connected by separately welding a pipe of a certain diameter to one side of the penetrating part of the arm body, but the suspension arm according to the present invention is By increasing the body base material through drawing molding in a continuous multi-stage process through a die equipped with a hollow bush, the ball joint connection unit integrated with the base material of the arm body is formed. It is constructed to have features that can improve not only simplicity, but also marketability, durability, and corrosion resistance.

4 is a vertical sectional view showing an excerpted portion of the through portion 116 formed in the center of the reference portion of the arm body, and referring to this, a brief description will be given of a molding process of the ball joint connecting portion integrally formed with the arm body.

That is, the suspension arm according to the present invention is integrally molded with a ball joint connection to the arm body while passing through the progressive mold device, and the progressive mold device is composed of upper and lower dies, but a bush whose diameter gradually enters one die is coupled to multi-stage. Through the drawing process of, the connection of the ball joint is increased.

Step D1 is a state in which the through part 155 having a certain direct hit is formed in the center of the reference part of the arm body through the piercing process, and the arm body having the through part 155 formed in this way is continuously processed through a plurality of mold devices. While moving, the drawing process is performed.

Step D2 is a sizing to increase the height of the boss part by forming a boss part of a certain height by using a punch for forming a ball joint connection part of a certain height around the through part, and then proceeding to the next steps (D3 to Dn) in order. The steps are carried out.

The inner diameter of the boss part formed in step D2 (d1) gradually decreases in the sizing process (d1>d2>d3>...dn), and the thickness of the boss part (t2…tn) and height (h2…hn) gradually increase. The ball joint connection part is formed in a size that can be combined with the ball joint while being molded to the required height and thickness.

Step Dx shown in the drawing enables processing of the shape required for the outer periphery of the boss part for additional ball joint connection after forming the ball joint connection part. As such, the suspension arm according to the present invention is a ball joint connection part at the reference part of the arm body. Is integrally molded through a multi-stage drawing process.

In addition, at both ends of the leg portions 130 of the arm body 110, a bush pipe connection portion 150 cut in a round shape is provided, and one side of the outer periphery of the cylindrical bush pipe 160 is coupled, and the cylindrical bush pipe 160 ), the bush 300 is fitted, and the cylindrical bush pipe 160 is coupled so that the through direction is formed in a direction perpendicular to the through part of the ball joint connection part 170.

In addition, the arm body 110 is injected into the injection mold in a state in which the flange portion 115 of a predetermined height bent in the arm body along the edges of the reference portion 120 and both leg portions 130 is formed. By injecting a plastic resin into the inside, the plastic resin mold 140 is integrally coupled to the female body 110 made of steel.

Meanwhile, the plastic resin mold 140 reduces the total weight of the suspension arm 100 and increases rigidity to prevent deformation, and is injected into the inner part of the arm body 110 in which the plastic resin mold 140 is molded. In order to increase the bonding force with the plastic resin, a plurality of reinforcing ribs 117 having a predetermined inclination with respect to the length direction of the leg portion 130 are welded at predetermined intervals.

Meanwhile, FIG. 5 is a simplified flowchart illustrating a manufacturing process of a vehicle suspension arm according to an embodiment of the present invention.

As shown in the flowchart of FIG. 5, the manufacturing process of the vehicle suspension arm 100 according to the embodiment of the present invention is a blanking step of cutting into a predetermined size and shape in order to manufacture a suspension arm using a high-tensile steel plate (S10). ), and a forming step (S20) of processing a flat steel plate into the basic shape of an arm body, and flanging and switching to form a flange portion by bending a certain height in one direction along the edge of the arm body that has undergone the forming step. The cruising step (S30) and the piercing step (S40) of forming a penetration part of a predetermined size in the center of the reference part are performed for forming the ball joint connection part for fastening the ball joint coupled to the arm body.
After performing a burring process on the inner periphery and outer periphery of the penetrating portion formed through the piercing step (S40) to form the ball joint joint forming and finishing step (S50), both ends of the arm body The bush pipe coupling step (S60) of coupling the cylindrical bush pipe so that the bush for connection to the vehicle body or the frame can be fastened to the leg portion is performed.

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Next, after performing the ball joint assembly step (S70) of coupling the ball joint to the arm body by pressing the prepared ball joint into the molded ball joint connection part, insert the arm body assembled with the ball joint into the injection mold. The plastic resin insert molding step (S80) of injecting plastic resin into the inside of the edge of the arm body is further performed, and the arm body on which the plastic resin insert molding is completed is separated from the injection mold, and the bush is press-fitted into the bush pipes provided on the legs at both ends. The bush coupling step (S90) to be coupled is performed.
In particular, the forming and finishing step (S50) of the ball joint connection includes a boss part forming step (S501) of forming a boss part having a predetermined height in one direction at the edge of the through part formed through the piercing step (S40), and the boss A hollow bushing that gradually decreases in diameter to the outer periphery of the boss part formed in the sub-molding step (S501) is pressed through a die equipped in multiple stages to increase the height in the vertical direction and increase it to have a certain thickness to connect the ball joint. It is configured to further include a multi-stage drawing step (S501) of integrally molding the connection part to the female body.

In the above-described manufacturing process of the vehicle suspension arm, it has been described that the plastic resin insert molding step (S80) is performed inside the arm body after the ball joint assembly step (S70), and finally the bush coupling step (S90) is performed. Depending on the installation structure and injection conditions of the plastic resin insert molding step may be performed first, and then the ball joint assembling step and the bush assembling step may be performed.

The flowchart shown in the drawings is for explaining an embodiment of the process of manufacturing the basalt, and there is no abnormality in the manufacturing quality of the basalt, and in order to simplify the manufacturing process or to simplify or optimize the manufacturing equipment, some of the subsequent processes are described. It is also possible to manufacture basalt by changing the order.

On the other hand, when explaining some of the manufacturing processes of the vehicle suspension arm described above, the first process, the blanking step (S10), is a process of cutting a high-tensile steel sheet into a certain size and shape suitable for the standard of the vehicle to be installed. This is a process of cutting the basic shape of the arm body so that the U-shaped or V-shaped leg portions are formed to be symmetrical to each other by extending a predetermined distance to both left and right sides of the reference portion to which the is coupled.

In addition, the second step of forming step (S20) is a shape processing step in which the arm body is transformed into a desired shape of the suspension arm by applying bending or deformation to the blanked arm body using a press.

The next step, the flanging and striking step (S30), is a process of forming a flange portion having a predetermined height by bending the edge portion of the flat arm body in one direction. The reason for forming the flange portion is to increase the rigidity of the arm body itself. It is to prevent separation and increase the bonding force of the plastic resin mold that is injected into the inside and molded to a certain thickness.

That is, the flange portion acts as a barrier wall to block the resin from flowing out of the arm body when the plastic resin is injected in the subsequent process, and also serves to guide the plastic resin mold to be molded to a certain height. .

In addition, the flanging and striking step (S30) may be performed in a plurality of steps according to the height of the flange portion formed at the edge of the arm body, and the height of the flange portion formed at this time is a reference portion having a difference in the width of the flange portion. It may be molded at different heights in the and leg portions.

In other words, when installing a vehicle, the height of the flange portion is increased in the case of a portion that receives relatively high force, and the height of the flange portion is lowered in the portion where the force is relatively low, so that the thickness of the plastic resin mold injected into the vehicle can be adjusted. It can also be configured.

The next step, the piercing step (S40), is a punching process for forming a fastening hole for fastening other parts coupled to the arm body, and at this time, a through part for forming a ball joint connection part is processed on the reference part.

In the next process, the forming and finishing step of the ball joint connection (S50), the boss part forming step (S501) of protruding the boss part at a certain height upwards to the edge part of the penetration part formed in the reference part in the piercing step is directed. The reason for the formation is to provide a protruding base for forming a ball joint connection having a certain thickness and height by increasing it step by step from the base material of the arm body.

In this way, after forming the through part in the reference part and forming the boss part in the edge part of the through part, a multi-stage drawing step (S502) for forming the ball joint connection part is performed.

In the multi-stage drawing step (S502), a bush whose inner diameter gradually decreases is provided on one of the upper and lower dies in the pressing process in which the upper and lower dies are continuously installed, and pressure is applied to the base material around the boss to increase the height of the boss in the vertical direction in which the boss is formed. While the ball joint is molded to have a certain thickness, a ball joint connection part to which the ball joint can be combined is formed.

After forming the ball joint connection in this way, a bush pipe coupling step (S60) of coupling the hollow bush pipe to the leg portions at both ends of the arm body is performed.

The reason why the hollow bush pipe is connected to the ends of both leg portions is to connect the bush for fixing the suspension arm to the vehicle body side, and this is performed in the same process as the conventional suspension arm.

On the other hand, the ball joint assembly step (S70) is a process of forcibly pressing a ball joint prepared in advance, that is, a spherical ball stud into the inside of the completed ball joint connection, and rotatably coupling the ball joint to the arm body. The plastic resin insert molding step (S80), which consists of a process of joining the peripheral parts and a post process, and the bush joining step (S90) of assembling by pressing the bush into the bush pipe, are performed in the same or similar processes as in the prior art.

In the above, the manufacturing method of the vehicle suspension arm according to the exemplary embodiment of the present invention and the vehicle suspension arm manufactured by the manufacturing method have been described mainly in a preferred embodiment, but within the scope of the technical idea of the present invention at the ordinary technical level of the person skilled in the art. In the process of changing some processes or adding some components may be further performed.

100: vehicle suspension arm 110: arm body
115: flange portion 116: through portion
117: reinforcing rib
120: reference portion 130: leg portion
140: plastic resin mold 150: bush pipe connection
160: bush pipe 170: ball joint connection
200: ball joint
300: bush

Claims (3)

delete delete A blanking step (S10) of processing the base material to form a U-shaped or V-shaped arm body by forming leg portions on both left and right sides based on the reference portion formed at one end; A forming step (S20) of processing the primary shape of the blanked base material using a press; Flanging and striking step (S30) of forming a flange having a predetermined height in one direction in order to improve rigidity at the edge of the foamed base material and improve the bonding force of the insert-molded product (S30); A piercing step (S40) of forming a through portion in the reference portion for mounting of a ball joint coupled to a steering knuckle coupled to a wheel; A ball joint connecting portion forming and finishing step (S50) of forming a shape of a ball joint connecting portion by performing burring processing on the inner periphery and outer periphery of the through portion formed in the piercing step (S40); A bush pipe coupling step (S60) of coupling a hollow bush pipe so that a bushing for connection to a vehicle body or a frame can be coupled to the leg portions of both ends of the arm body; A ball joint assembly step (S70) of rotatably coupled to the arm body by pressing the ball joint into the formed ball joint connecting portion; A plastic resin insert molding step (S80) of injecting a plastic resin into the edge of the female body by inserting the female body assembled with the ball joint into the injection mold (S80); Including; a bush coupling step (S90) of separating the plastic resin insert molding completed arm body from the injection mold and assembling the bush by pressing the bush into the bush pipe provided at both ends of the leg portion (S90),
The ball joint connection part forming and finishing step (S50),
A boss part forming step (S501) of forming a boss part having a predetermined height in one direction on the edge of the through part formed through the piercing step (S40),
The hollow bushing, whose diameter gradually decreases to the outer periphery of the boss part formed in the boss part forming step (S501), is pressed through a die provided in multi-stage to increase the height in the vertical direction and increase it to have a certain thickness. Multi-stage drawing step (S501) of integrally molding the ball joint connection portion to the arm body; a method for manufacturing a vehicle suspension arm, characterized in that it further comprises.

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